"Just because there's been a couple of days of cooler weather doesn't mean it won't heat up… we might get temperatures that reach the 40s," senior forecaster Stephen King said.

The hot weather will be monitored closely by fire authorities across the state, who are already on high alert following a number of devastating bushfires in December.

Country Fire Authority state duty officer Rohan Luke said while the fire-danger ratings had not been confirmed for coming weeks, January and February were typically the riskiest periods.

"We're moving out of a period where there's been some moisture in the air under the influence of the current weather patterns," he said.

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Warm temperatures are expected by Sunday.

Mr Luke warned the hot and gusty weather that had stoked bushfires in Barnawartha and on the Great Ocean Road would likely continue throughout January.

"As winds increase, the fire dangers increase. That's one of the major drivers [of bushfires]," he said.

Mr Luke urged Victorians to be vigilant and prepared by monitoring fire-danger ratings and ensuring their emergency plans were in place.

This week's cool conditions, with temperatures barely reaching the mid 20s, were not that unusual for the post-Christmas period, according to forecaster Stephen King said.

"We have also been experiencing a more easterly flow which has led to more moisture and cloud cover and more unstable conditions."

The bureau has also suggested that El Nino indicators have peaked in recent weeks, contributing to 2015 being Australia's fifth-warmest year on record with temperatures reaching 0.83 degrees above average.

For the owners of many summer hot spots, these hotter weather predictions are a welcome change from last year.

Matt Waters, manager at the frozen yoghurt shop Yo Chi, said that compared to last year, this summer has been significantly hotter.

"In general, the weather has been favourable for business, business has been positive and going well so far," he said.